Floating chuck



C. UNGERMAN..

FLOATING CHUCK.

APPLICATION FILED FEB.5.1919.

. Patented ot. 26,1920. I

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- UNITEUSTTS PATENTS i'orF1,eE.f-

CARI.A UNGERMAN, 'or DETROIRMICHIGAN, nssIGNoRfTo AMERICAN NIRIA-I.PROD- Uc'rs coRP., or DEIROIT, MICHIGAN, A CORPORATION or' MICHIGAN.

,FLCATING CHUCK. v

Specification o'f Letters Patent.

atentados@ ze, 192e.

Application filed February 5, 19.19. Serial No.25,085`.`4 f

i To all whom t may concern.'

Be it known that I, CARL UNGERMAN, a citizen of Bohemia, residin atDetroit, county of Wayne, State of ichigan, have invented a new anduseful Improvement in Floating Chucks, of which the following is aspecification.

This invention relates to floating chucks,

and has for its object a tool-holding member which has a radiallysliding pivot with respect to the member which is fastened to themachine. v

TheseA floating chucks are used primarily for allowing freedom ofVmovement for an end miller to follow a jig to outa polygonal hole. Endmilling cutters and jigs for this purpose are old in the art. Theimprovement resides in the improved form of chuck.

In the drawings,-

Figure l is a longitudinal section of the floating chuck showing thetool in relation to the jig and work. 3

Fig. 2 is an elevation showing how the parts of the chuck assemble.

Fig. 3 is an inside plan view of the head a, which is the part fastenedto the machine.

. Fig. et is a section on the line 1f-41 of Fig. 1.

Fig. 5 is a plan view of the. tool-shank holder or member e of Fig. 2. v

Fig. 6 is a detail of the radial slide j of Fig. 2.l

The end milling cutter lits yinto a jig a fastened in the jig sleeve Zthat can be attached to the work by a set screw. Thejig n, has apolygonal hole of precisely the shape that is desired to be made in thework. Preferably theV work is first bored with a hole of circular crosssection, although this is not necessary. The milling cutter always hasone less flute and cutting, edge than the polygon that is desired to bemilled out. The greatest breadth of the cutter through its center isonly slightly less than the minimum breadth of the polygon through thecenter. Consequently the fiuted cutter will follow the pattern of thejig accurately provided the tool-shank holder is permitted universalmovement within a given plane while tied to the head that connects withthe machine so that it either rotates withthat member or is held fromrotation by that member while the work rotates. This is well under- -jigheld stationar stood in the art and needs no more elaborate description.Chucks to allow, toolsrthisiuni; lversal movement in one plane havealready been designed, but so far as I am aware they operate on theprinciple, familiar in machine tools, of a carriage and a cross carriageboth of which are slidable in paths at right angles to each other.

My improvement resides in a lchuck that vadopts what I' believe ,toV bea different methodV of getting the universal movability in a givenplane, namely, by a slide and pivot in place of two slides. e is thetool-shank holder in the form of a sleeve with an annular flange z,radially slotted at z' to receive the small slide j that fits rotatablyupon the v pin which is driven into the head a (the memberfimmediatelyconnected to the machine); m isa disk .perforated for anti- 'rotatetogether or when one is held from ro'.

tation the lother will be heldfrom rotation. r The slide being movableradially freely with 8.15 respect to the tool-shank holder rand beingpivoted toV the pin c, obviouslyv the toolshank holder has a. lateralswinging or n pivotal motion with respect to the member on an arccrossing the-line of travel'of the 90 slide j. The result of this doublemovement is universal movement within a. given plane and given limits ofthat plane. The chuck and work may be used yon vari+v ous forms ofmachine tools* for instance, it may be applied to a lathe. When appliedto, a lathe preferably the member a is placed` in the tail stock andheld from rotation. The f work is placed in the head stock and rotated.

In some machines and in a'lathe the chuck 100' itself may be rotated andthe work withthe v Obviously the sfide could slide in a groove of thehead and theHpin be driven into the tool-shank holder. ence such asimple reversal of parts is contemplatedk as within the spirit of theclaim although it l defines the elements descriptively as shown in thedrawin gs What I claim is :f

A floating chuck for drilling square holes,

having in combination, a head provided with i an extended hollowportion. for receivingA a driving arbor, a tool shank holder oon1g r`isHing an extended hollow neck portion to l0 which the tool ymay' besecured, the tool shank holder being provided with a radial guidingrecess in its upper surface, a disk provided 1 with anti-friction ballsinterposed between i the driving head and the'tool shank holder,

a pin secured to the driving head, a slide itted to slide in the recessin the tool shank lholder and having a pivotal fitting in the said pin,and a housing having va flanged portion fitting under the tool shankholder and l*having'a barrel-portion engaging and re- In witness whereofI have hereunto set my y hand on the 29th' daairir.

